class-breadcrumbs.php on line 445

Hello,

It seems that the issue is related to a % character being present in the “Archive Format” field in Rank Math > General Settings > Breadcrumbs. Please make sure that the field does not contain a percentage sign on its own, it should always be followed by an s character, like so: %s. If you want to display a literal % sign here then you need to insert %%, which will be replaced by a simple % when the breadcrumbs are displayed.

If the above suggestion does not help, please edit the first post on this ticket and include your WordPress logins in the designated Sensitive Data section.

Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:

https://wordpress.org/plugins/temporary-login-without-password/

You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):

https://wordpress.org/plugins/wp-security-audit-log/

We really look forward to helping you.